Granted Patent
Utility
US 4,279,802 · App. 06/059,426
Method for the production of a pigment preparation for coloring linear polyesters in the melt
Inventors:
Andreas Laely, Gunther Zwahlen, Lothar Buxbaum
Patented Case
View Patent ↗
Granted: Jul 21, 1981
Filed: Jul 20, 1979
Inventors
Andreas Laely
Gunther Zwahlen
Lothar Buxbaum
Assignee (at issue)
Ciba-Geigy
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.